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CRITICAL · CVSS 9.8 CISA Known Exploited Vulnerability

CVE-2022-37042

Synacor Zimbra Collaboration Suite (ZCS) Authentication Bypass Vulnerability

Synacor Zimbra Collaboration Suite (ZCS)

Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.

CVSS
9.8
CRITICAL
EPSS
92.1%
30-day exploitation
Ransomware groups
0
recorded exploiting
Published
12 Aug 2022
CWE-22

Exploitation status

CISA Known Exploited Vulnerabilities

Listed by CISA on 11 August 2022. US federal agencies were required to remediate it by 1 September 2022. CISA records this vulnerability as known to be used in ransomware campaigns.

EPSS — exploitation probability

FIRST puts the probability of exploitation activity in the next 30 days at 92.1%, which is higher than 99.8% of all scored vulnerabilities. EPSS is a forecast of activity, not a measure of severity, and it is rescored daily.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Frequently asked questions

Is CVE-2022-37042 being exploited by ransomware groups?

No ransomware group in this database is currently recorded as exploiting CVE-2022-37042.

What does CVE-2022-37042 affect?

CVE-2022-37042 affects Synacor Zimbra Collaboration Suite (ZCS). Zimbra Collaboration Suite (ZCS) 8.8.15 and 9.0 has mboximport functionality that receives a ZIP archive and extracts files from it. By bypassing authentication (i.e., not having an authtoken), an attacker can upload arbitrary files to the system, leading to directory traversal and remote code execution. NOTE: this issue exists because of an incomplete fix for CVE-2022-27925.

How severe is CVE-2022-37042?

CVE-2022-37042 is rated CRITICAL with a CVSS base score of 9.8. EPSS puts the probability of exploitation in the next 30 days at 92.1%, higher than 99.8% of all scored vulnerabilities. It is listed in the CISA Known Exploited Vulnerabilities catalog, with a federal remediation deadline of 1 September 2022.

How should organisations respond to CVE-2022-37042?

Apply the vendor patch for Synacor Zimbra Collaboration Suite (ZCS) as the first priority, and treat any internet-facing instance as the most urgent. Because this vulnerability is associated with ransomware activity, also review whether the affected systems were reachable before patching, rather than assuming that patching alone closes the incident.